Process manager templating & game importing (#96)

* feat: add new template options, asahi support, and refactoring

* feat: install dir scanning, validation fixes, progress fixes, download manager refactor

This kind of ballooned out of scope, but I implemented some much
needed fixes for the download manager.

First off, I cleanup the Downloadable trait, there was some
duplication of function.

Second, I refactored the "validate" into the GameDownloadAgent,
which calls a 'validate_chunk_logic' yada, same structure as
downloading.

Third, I fixed the progress and validation issues.

Fourth, I added game scanning

* feat: out of box support for Asahi Linux

* fix: clippy

* fix: don't break database

desktop/app.vue

@@ -27,6 +27,7 @@ try {
   console.error("failed to parse state", e);
 }
 
+// This is inefficient but apparently we do it lol
 router.beforeEach(async () => {
   try {
     state.value = JSON.parse(await invoke("fetch_state"));